1, if the number of green moss is small and the water quality is clear, this is a good thing. In fact, fish like green water environment, indicating that the water quality is rich and there are many nutrients. Green moss and clear water are the best water quality for fish farming. If even moss can't survive in the fish tank, it means that the water quality has deteriorated to a certain extent;
2. If the green moss grows too fast or too much, it is a bad thing. First, there is a lot of moss, which shows that the nitrification system in the tank is not well established, and the nitrification system is a trade-off relationship with various algae. If there are too many green algae, it will consume a lot of oxygen in the water, which will easily lead to hypoxia in goldfish.
Extended data:
Green moss overgrowth generally has two reasons:
1, the fish tank grows fast because it is placed in too strong light. The solution is to change the position of the fish tank and put it in a semi-shady place, which can not only illuminate, but also fall outside the scope of strong light irradiation;
2. The water is not changed frequently enough, and the fish tank is not cleaned regularly. Generally, the water should be changed once every three days, once every 1-2 weeks if it is well filtered, and the fish tank should be cleaned once a month to remove the green algae attached to the tank wall and decorations.